<template>
  <div>
      <span>count: {{count}}</span>
      <button @click="handleClick">count++</button>
  </div>
</template>

<script>
export default {
    data(){
        return{
            count: 0
        }
    },
    methods: {
        handleClick() {
            this.count++;
            this.$emit('change',this.count)
        }
    }
}
</script>

<style>

</style>
